Methods.A neutral hydrogen
(Hi) line survey carried out at the Instituto Argentino de
Radioastronomía (IAR) and the Southern Galactic Plane Survey
(SGPS) were
the main databases used in this investigation.

Results.A new Hi supershell
(GS263-02+45) was found in the outer part of the Galaxy. This structure is
located at
a distance of 5.3 ± 1 kpc from the Sun and has a linear diameter of about
665 ± 40 pc. The expansion velocity of the supershell is ~14 km s-1.
The total amount of atomic gas related to GS263-02+45 is
~2 106. Based on the analysis of the SGPS
Hi data it is concluded that the OB-association Bochum 7 is likely to
be interacting with GS263-02+45. This fact together with distance and age
arguments may indicate that Bochum 7 was born as a consequence of the
evolution of GS263-02+45.

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